Improvement in carpenters  bevels



W. H. LAUGHLIN. Improvement in Carpenters" Bevels. .129,737.

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WILLIAM HQLAUGHLIN, OF QUVINOY, ILLINOIS.

IMPROVEMENT IN CARPENTERS BEVEL'S.

Specification forming part of Letters Patent No. 129,737, dated July 23, 1872.

Specijication describinga new and Improved Try-Square and Bevel, invented by WILLIAM H. LAUGHLIN, of Quincy, in the county of 'l Adams and State of Illinois.

The object of this invention is to so construct a try-square and bevel that the blade, in whatever position it may be placed, shall be fastened so as not to vary when adjusted, and so that the combined tool may lie flat on either side, and without the common fastening thumb-screws; and it consists in a milled or serrated disk so connected with the blade that it moves or turns only when the blade moves or turns, and in a double ratchet-pawl, which is made to enga-ge with the disk by means of a screw-rod, by whichpawl, and consequently the blade, is held immovable when the blade is once adjusted, as will be hereinafter more fully set forth and described.

4In the accompanying drawing, Figure l represents a top view, and4 Fig. 2 a vertical e longitudinal section of Fig. 1 taken on the line .fr a'.

Similar letters 0f reference indicate correspending parts.

` tion. The part. D of the stock is shorter than the other part, but a metallic plate, f, is attached to its inner sides, which extends out as far as the other part E. Between this part and the plate E the blade works, and on the plate the disk C is placed. The thickness of the disk is equal to the thickness of the part.

D, so that its face or outside is flush with the side D of the stock. g represents the slot in the blade. h is a projection on the under side of the disk C of oblong form, whichu passes through the plate fand its into the slot in the blade, as seen in Fig. 2. Itwill be seen from this arrangement that while the disk C is held stationary the blade cannot move except longitudinally. The disk is confined to the part E of the stock by means of the cen tral screw t', and any desired amount of friction may be produced thereby when necessary to prevent the longitudinal movements of the blade and hold the parts securelytogether. Instead of allowing the wood of the part E to extend to the end of the stock, Lthe fastening-screw t may be made to enter solid metal, i

if desired. J is a pawlin the form of an arc of a circle, the inner circle of which corresponds with and fits the vedge of the disk. The edge of the disk is milled or serrated, as seen in the drawing. The inner circle of the pawl is provided with teethmore or less in number-which are made to engage with the teeth of the disk, and hold both ways, so that when pressed up to the disk the latter is im` movable. k is a screw-rod attached to theV back of the pawl, extending back in a groove in the part D of the stock, with a thumbwrench, L, on its end.' The screw of thisrod works through the mounting M of the part D. For adjusting the blade to any desired angle the .pawl is drawn back by turning the rod, and when the blade is adjusted to the required angle the pawl is pressed up to the disk by turning the rod. The blade, being connected with the disk C, as before stated, is thus held rigidly to its position, whether adjusted to a right angle with the stock to form a try-square, as seen in dotted lines, or at any other angle or parallel with the stock, as seen in the drawing.

I do not limit or confine myself to the precise form or arrangement of any of the parts described, as they may be varied in many ways without departing from my invention.

I am aware that disk C and projection l1. are not new in themselves; but

Having thus described my invention, I claim as new and desire to secure by Letters Pat- 

